Pile-driver buffer.



PATENTED SEPT. 8, 1903.

L. P. ERIESTEDT. PILE DRIVER BUFFER.

APPLIoATIoN FILED JUL; 2, 1903.

N0 MODEL.

mg Noams PETERS cu. PHOTO-ums.. wAsHlNuToN, n

. lar recesses 3.

LUTHER P. FRIEs'rED'r,

Patented September 8, 1&903.

PATENT OEEICE.

or CHICAGO, ILLINOIS.

PILE-DRIVER BUFFER.`

QQECIFICATION forming part of Letters Patent No. 738,312, datedSeptember 8, 1903. Application filed .Tuly 2,1903. Serial No. 164,036.(No model.) i

To @ZZ whom. t may concern:

Be it known that I, LUTHER P. FRIESTEDT, a citizen of the United Statesof America, and a resident of Chicago, in the county of Cook new anduseful Improvements in Pile-Driver Buffers, of which the following is aspecification.

My invention relates particularly to a structure for pile-driversadapted for driving metallic bars to form interlocking channel-barpiling. Its main object is to provide in piledrivers a suitablestructure to act as a'buifer for receiving the impact. of thestriking-head ofjthe pile-driver and preventing the peening effect of ametallic driver-head striking directly upon the ends of the bars whensame are being driven. v

I accomplish this objectby the construction shown in the accompanyingdrawings, in Which- Figure 1 is a front elevation showing my buffer inconnection with a pile-driver head and the guide-rails for same, partlybroken away. Fig. 2 is a top plan of the buffer with the central woodenblock removed from its seat in the upper met-al plate.

In the device shown the plates l and 2 are each provided with recesses3, tting the guide-rails 4. A block 5, of wood, pulp, or otherslightly-resilient material, fits between the plates 1 and 2 and isprovided with simi- The plates l and 2, with the intermediate block 5,are secured together bymeans of bolts 6, having their heads countersunkin the lower face of the plate 2. In practice I have found that softpine soaked in water forms a satisfactory filling-block 5. In the upperplate 1 is a socket 7 for receiving the block 8, which is made of Woodor other suitable material, for receiving the direct impact of thestriking-head 9 of the piledriver. I have found that a block of hardwood, such as oak, is satisfactory for this purpose. The plates 1 and 2may be made of cast steel. Y i

The operation of the device shownis as follows: The buer when connectedas shown in Fig. 1 is placed upon the channel-bar pil-4 ing with itsrecesses 3 engaging the guiderails 4, so as to follow the piling whensame is driven by means of the striking-head 9.

The blocks 8 Vand 5 serve to cushion the blow.' The buffer restsdirectly on the upper end of the bar which is being driven and transmitsthe force of the blow of the pile-driver hamand State of Illinois, haveinvented certainV mer in such manner as to prevent the peening effectandY splitting of the bar, which would occur if the hammer struckdirectly upon the bar.

It will be understood that some of the details of the structure shownmay be altered without departing from the spirit of my invention. Itherefore do not confine myself to such details except as hereinafterlimited in the claims.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A pile'driver buffer, comprising a pair of metallic plates having aresilient block bolted between same, one of said plates being providedwith suitable recesses for receiving the guide-rails of a pile-driver,and preventing lateral displacement of the buffer, substantially asdescribed.

2. A pile-driver buffer, comprising a pair of metallic plates having aresilient block bolted between same, one of said plates being providedwith suitable recesses for receiving the guide-rails of a pile-driver,the upper plate having a recess in its upper face, and a block of softermaterial than said plate seated in said recess and adapted to receivethe impact of the pile-driver hammer, substantially as described.

3. In "a pile-driver, the combination of a hammer with the guide-railsfor same, and a buffer formed of a pair of metallic plates with aresilient block secured between same, said buer being slidably mountedbetween said rails and being provided with means for preventing itsdisplacement laterally of said rail, substantially as described.

4.. A pile-driver buffer, comprising a pair of metallic plates, anintermediate block of softer material adapted to act as a cushion, saidplates and block being secured together and each being suitably recessedto engage and travel alongthe guide-rails ofl ar piledriver,substantially as described.

5. A pile-driver buffer, comprising a pair of metallic plates, a Woodenblock secured between same and each suitably recessed to engage andtravel along the guide-rails of a IOO pile-driver, said upper' platehaving a socket in its upper face, and a hard-wood block seated in saidsocket and projecting above same substantially as described'.

5 6. In a pile-driver, the combination of a pair of vertically-disposedguide-rails; a hammer slidably mounted between said guiderails; a bnerslidably mounted below said hammer between said rails and independroently of said hammer and secured against movement laterally of saidrails, said buer comprising a pair of plates separated by a layer ofsofter non-metallic material, substantially as described.

Signed at Chieago this 30th day of June, l5 1903'.

. LUTHER P. FRIESTEDT. Witnesses:

EUGENE A. RUMMLER, RUDoW RUMMLER.

